(fix) more kit cleanup (#1927)

* proxy document registroy for better memory consumption, deduplicate code by creating shared helpers in svelte2tsx

* remove unnecessary method, add readDirectory

* inlay hints

Author: dummdidumm

packages/language-server/package.json

@@ -57,7 +57,7 @@
         "prettier-plugin-svelte": "~2.9.0",
         "svelte": "^3.55.0",
         "svelte-preprocess": "~5.0.0",
-        "svelte2tsx": "~0.6.0",
+        "svelte2tsx": "~0.6.4",
         "typescript": "*",
         "vscode-css-languageservice": "~6.2.0",
         "vscode-html-languageservice": "~5.0.0",